Taxon - Links and literature
Gill F., Donsker D. & Rasmussen P. (eds): IOC World Bird List 11.1 [http://www.worldbirdnames.org/] [as Calliope calliope beicki (Meise, 1937)]Data retrieved on: 22 April 2021
Gill F., Donsker D. & Rasmussen P. (eds): IOC World Bird List 11.1 [http://www.worldbirdnames.org/] [as Calliope calliope beicki (Meise, 1937)]